Susan Aldworth’s father passed away several years ago, but when she closes her eyes to picture his face it’s as if she were staring at a photograph. Susan thought mental imagery was a universal ability, so she was shocked to learn that some people, known as aphantasics, don’t have a mind’s eye at all. A London-based visual artist, Susan uses experimental printmaking and filmmaking to explore human identity through medicine, neuroscience and philosophy. She’s at upper end of mental visual spectrum, a hyperphantasic, able to create mental pictures that are rich with color and nuance. Whereas aphantasics typically score a zero on the questionnaire that assesses visual imagery (VVIQ), Susan scored at the upper limit. “I can’t imagine a life without mental pictures,” says…